On the carriageway at whose entrance this sign is placed...
Signage: Vertical signs
This sign (R-405) indicates a **mandatory carriageway** specifically for **two-wheeled motorcycles and three-wheeled vehicles classified as motorcycles**, which must travel on it.
Explanation
Mandatory carriageway for two-wheeled motorcycles (R-405)
Sign **R-405** indicates an **obligation** for drivers of:
- **Two-wheeled motorcycles**
- **Three-wheeled vehicles treated as motorcycles**
to **drive on the carriageway** at whose **entrance** the sign is placed.
This means that, from that sign onwards, **these vehicles must use that carriageway** and may not drive on other parts of the road, such as hard shoulders or unauthorized lanes.
It is a **regulatory** sign (obligation), so compliance is **compulsory** and not optional.
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